ebiten/examples/audioinfiniteloop/main.go

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// Copyright 2017 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"bytes"
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"fmt"
"log"
"time"
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"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/audio"
"github.com/hajimehoshi/ebiten/v2/audio/vorbis"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
raudio "github.com/hajimehoshi/ebiten/v2/examples/resources/audio"
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)
const (
screenWidth = 640
screenHeight = 480
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sampleRate = 48000
bytesPerSample = 4 // 2 channels * 2 bytes (16 bit)
introLengthInSecond = 5
loopLengthInSecond = 4
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)
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type Game struct {
player *audio.Player
audioContext *audio.Context
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}
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func (g *Game) Update() error {
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if g.player != nil {
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return nil
}
if g.audioContext == nil {
g.audioContext = audio.NewContext(sampleRate)
}
// Decode an Ogg file.
// oggS is a decoded io.ReadCloser and io.Seeker.
oggS, err := vorbis.DecodeWithoutResampling(bytes.NewReader(raudio.Ragtime_ogg))
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if err != nil {
return err
}
// Create an infinite loop stream from the decoded bytes.
// s is still an io.ReadCloser and io.Seeker.
s := audio.NewInfiniteLoopWithIntro(oggS, introLengthInSecond*bytesPerSample*sampleRate, loopLengthInSecond*bytesPerSample*sampleRate)
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g.player, err = g.audioContext.NewPlayer(s)
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if err != nil {
return err
}
// Play the infinite-length stream. This never ends.
g.player.Play()
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
pos := g.player.Current()
if pos > 5*time.Second {
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pos = (g.player.Current()-5*time.Second)%(4*time.Second) + 5*time.Second
}
msg := fmt.Sprintf(`TPS: %0.2f
This is an example using
audio.NewInfiniteLoopWithIntro.
Intro: 0[s] - %[2]d[s]
Loop: %[2]d[s] - %[3]d[s]
Current: %0.2[4]f[s]`, ebiten.ActualTPS(), introLengthInSecond, introLengthInSecond+loopLengthInSecond, float64(pos)/float64(time.Second))
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ebitenutil.DebugPrint(screen, msg)
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}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
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}
func main() {
ebiten.SetWindowSize(screenWidth, screenHeight)
ebiten.SetWindowTitle("Audio Infinite Loop (Ebitengine Demo)")
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if err := ebiten.RunGame(&Game{}); err != nil {
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log.Fatal(err)
}
}